Thermodynamic and achievable efficiencies for solar-driven electrochemical reduction of carbon dioxide to transportation fuels

Singh Meenesh R.; Clark Ezra L.; Bell Alexis T.

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Thermodynamic and achievable efficiencies for solar-driven electrochemical reduction of carbon dioxide to transportation fuels

机译：Thermodynamic and achievable efficiencies for solar-driven electrochemical reduction of carbon dioxide to transportation fuels

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Thermodynamic, achievable, and realistic efficiency limits of solar-driven electrochemical conversion of water and carbon dioxide to fuels are investigated as functions of light-absorber composition and configuration, and catalyst composition. The maximum thermodynamic efficiency at 1-sun illumination for adiabatic electrochemical synthesis of various solar fuels is in the range of 32-42. Single-, double-, and triple-junction light absorbers are found to be optimal for electrochemical load ranges of 0-0.9 V, 0.9-1.95 V, and 1.95-3.5 V, respectively. Achievable solar-to-fuel (STF) efficiencies are determined using ideal double-and triple-junction light absorbers and the electrochemical load curves for CO2 reduction on silver and copper cathodes, and water oxidation kinetics over iridium oxide. The maximum achievable STF efficiencies for synthesis gas (H-2 and CO) and Hythane (H-2 and CH4) are 18.4 and 20.3, respectively. Whereas the realistic STF efficiency of photoelectrochemical cells (PECs) can be as low as 0.8, tandem PECs and photovoltaic (PV)-electrolyzers can operate at 7.2 under identical operating conditions. We show that the composition and energy content of solar fuels can also be adjusted by tuning the band-gaps of triple-junction light absorbers and/or the ratio of catalyst-to-PV area, and that the synthesis of liquid products and C2H4 have high profitability indices.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2015年第45期|E6111-E6118|共8页
作者
Singh Meenesh R.; Clark Ezra L.; Bell Alexis T.;
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作者单位

Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat Sci, Joint Ctr Artificial Photosynth, Berkeley, CA 94720 USA;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
artificial photosynthesis; electrochemical CO2 reduction; solar-to-fuel efficiency; photoelectrochemical cells; photovoltaic-electrolyzer;

Thermodynamic and achievable efficiencies for solar-driven electrochemical reduction of carbon dioxide to transportation fuels

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